particles.setColor

particles.setColor sets Color on a particles object. It takes id, c1, c2 and colorDead. colorDead is optional.

particles.setColor(id, c1, c2, colorDead?)

function start() {  particles.create('main', 10);  particles.setColor('main', 1, 1);}

particles.create is there to give the call something to act on; particles.setColor is the line that matters. The code sits in start(), which the engine calls once, when the entity spawns.